Variable template alias for std::is_invocable_r_v.
std::is_invocable_r_v
Declared in <bsl_type_traits.h>
<bsl_type_traits.h>
template< class RET, class TYPE, class... Args> inline constexpr bool is_invocable_r_v = std::is_invocable_r<RET, TYPE, Args...>::value;